Impulse type rotary crusher



Aug. 29, 1939.

H. SAKURAI pmrunsx-z TYPE ROTARY CRUSHER Filed. Feb. 4, 1957' 2 Sheets-Sheet 1 Will/la- H. SAKURAI' IMPULSE TYPE ROTARY CRUSHER Aug. 29, 1939.

' Filed Feb. 4, 1957 2 Sheets-Sheet 2 INVENTOR.

Q tUW K/ ATTORNEVS Patented Aug. 29, 1939 UNITED STATES PATENT OFFICE IMPULSE TYPE ROTARY CBUSHER Hyosuke Sakurai, Chita District, Japan Application February 4, 1937, Serial No. 123,956 5 Claims. (01. 83-11) My invention relates to improvements in impulse type rotary crushers and more particularly to an improved construction and arrangement of working parts, and has for its object the'provision of an improved rotary crusher most suitable for obtaining desirable fine powders at higher emciency with less danger of breaking the working parts.

For a better understanding of my invention reference is taken to the accompanying drawings, in which Fig. 1 is a sectional side elevation of a rotary crusher embodying my invention; Fig. 2 is an elevation partly in section of Fig. 1; Fig. 3 is an enlarged sectional view of a detailed portion;

, Fig. 4 is a front view of the rotary disc; Fig. 5 is a partial sectional view of the stationary disc and Fig. 6 is a perspective view of stationary bars formed into a cage.

Referring to the drawings, l represents the easing of the crusher; 2 are side covers; 3 represents a bracket for supporting the rotor shaft 4 having a pulley 5 secured to it; 6 re resents inlet passages leading to the rotor chamber and I is a hopper for receiving the material to be crushed.

In accordance with this invention a rotor disc 8 secured to the shaft 4 is provided with a number of pins 9 projecting on both sides of the disc.

These pins are arranged on concentric circles and on spiral curves at, each pin having the cutting edge l located in the direction of rotation. To the end covers 2 are secured series of stationary bars H arranged on concentric circles and pro jecting in the spaces between and adjacent to the revolving pins 9 secured to the rotor 8. The stationary bars II have angular cross-section and those bars ll arranged'on the same circle are cast integrally with end rings l I just like a'squirrel cage and the cage is secured by means of set screws l2 to thedisc l3.- Thus the rotor pins 9 projecting from the rotor disc 8 on both sides pass through the spaces between the cage bars I l and also adjacent thereto as shown in Fig. 3. The stationary disc I3 is also provided with radially disposed ribs or teeth M on its inner surface. 15 is a cylindrical drum or screen surrounding the rotor and is made of a perforated plate or wire gauze. The perforated plate or wire gauze i is secured to the side rings it which are connected together by means of screw rods H.

The hopper I is provided with adjustable gates [8 which are regulated by a handle l9 through suitable gearing. 20 is a tiltable bottom supported on a pivot 21 and operated by link mechanism 22 which is connected to an eccentric disc or cam 23 on a side shaft 24. The side shaft 24 may be driven from the rotor shaft 4 through the gearing 25 and 26. In the passages 6 communicating between the bottom opening of the hopper and the inlet openings provided for the side covers and crushed material or air containing pulverized material. The'operation of the rotary crusher as above describedis as follows: The materials to be crushed such, for instance, as dried fishes are put in the hopper 1 and the machine is driven by a suitable prime mover such as an electric motor, not shown. The adjustable gates of the hopper areopened and the bottom 2! is tilted an'd oscillated to-and-fro so that the materials may be delivered into the passages 6 alternately. Ifso'me magnetic materials such as nails or iron pieces aremixed in the materials they are attracted by the magnetic separator 28 so that the danger of breaking the crusher by the iron pieces can be avoided. The material introduced into the rotor 30 chamber is thrown outwardly by thecentrifugal force of the high speed rotor disc 8 and is torn, crushed and'ground by the co-op'eration of the running pins 9 and the stationary bars Ii as well as the teeth IS. The angular edges of pins 9 and bars il effect cutting action for fibrous materials and the cut or crushed pieces are impinged against the stationary bars and are beaten by the revolving pins in rapid repetitions.

When the material is crushed into desired 40 small pieces or fine powders sufiiciently to pass through theperforated plate or screen I5, they are delivered through the opening 3| together with the air blast or collected into a box at the bottom of the casing. The air may be sucked from the inlet opening 29 into the rotor chamber of the crusher and the excessive air may be exhausted from the opening 30in order to relieve the excessive high pressure in the casing.

The crushed powder may be sucked out by a fan through the opening 3| or may be collected -in the bottom casing and then conveyed to a desired place. In this case the opening 30 should be closed by means of a valve. The delivery opening 3| ofthe casing may be connected with the suction opening for the purpose of subjecting repeated crushing actions to the material.-

The cage-like construction of stationary bars prevents the bending of each bar and provides very rigid cutting and crushing edges.

I claim:

1. A rotary impulse crusher comprising, in combination, an enclosing casing having an air intake port arranged substantially in the central plane of the casing and at the upper portion thereof and two inlet passages for raw materials arranged symmetrically on opposite sides of said air intake port and communicating therewith, a shaft rotatably mounted within said casing below said material inlet passages, a disk carried by said shaft, a plurality of pins extending axially from each race of said disk, the pins on each face being arranged in a plurality of concentric circles and the pins of adjacent circles being so disposed with respect to each other as to provide a series of spiral rows of pins converging toward the shaft, each of said pins being provided with a cutting edge on the free end thereof and with a second cutting edge onthe longitudinal side thereof in the direction vof rotation of thedisk, a plurality of radially extending alternating grooves and projections on the walls of the casing on both sides of said disk and being-in close proximity to the free ends of the pins carried thereby, a plurality of stationary bars attached to said casing and extending axially of said rotor disk, and being arranged in concentric, circular series, the bars of each circular series extending between adjacent circular series of pins carried bysaid disk and having cutting edges formed thereon which cooperate with the cutting edges on the longitudinal sides of said pins, screening means surrounding the grinding assembly, and a single discharge means for crushed and screened material arranged substantially in the central plane of the casing.

2. A rotary impulse-crusher according to claim 1, in which the alternate series of radially-extending projections and grooves are formed in annular plates which are attached to the casing on opposite sides of the disk.

3. A rotary impulse crusher according to claim 1, in which the stationary bars of each circular series are attached at their opposite ends to annular spacing and supporting rings, thereby providing a squirrel-cage structure.

4. A rotary impulsecrusher according to claim 1, in which the stationary bars of each circular series are attached at their opposite ends to annular spacing and supporting rings to form a squirrel-cage structure, one of said rings of each such structure being attached to the wall of the casing.

5. A rotary impulse crusher according to claim 1, in which a hopper is provided at the upper portion of the casing to receive raw materials, said hopper communicating with said casing through said two inlet passages for raw materials, a tiltable'bottom disposed between said hopper and said inlet passages, and means for operating said tiltable bottom to selectively open or close said passages.

HYOSUKE SAKURAI. 

